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| author | Dan Williams <dan.j.williams@intel.com> | 2022-06-04 15:49:53 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-07-25 12:18:07 -0700 |
| commit | b9686e8c8e39d4072081ef078c04915ee51c8af4 (patch) | |
| tree | afda61f1eada2060207f9a43c911c7857f605563 /Documentation/ABI | |
| parent | 23a22cd1c98be518774fe7f7e8a5203af050525a (diff) | |
| download | lwn-b9686e8c8e39d4072081ef078c04915ee51c8af4.tar.gz lwn-b9686e8c8e39d4072081ef078c04915ee51c8af4.zip | |
cxl/region: Enable the assignment of endpoint decoders to regions
The region provisioning process involves allocating DPA to a set of
endpoint decoders, and HPA plus the region geometry to a region device.
Then the decoder is assigned to the region. At this point several
validation steps can be performed to validate that the decoder is
suitable to participate in the region.
Co-developed-by: Ben Widawsky <bwidawsk@kernel.org>
Signed-off-by: Ben Widawsky <bwidawsk@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/165784336184.1758207.16403282029203949622.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-cxl | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 52764c172338..4ecf6cf40fd3 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -353,3 +353,22 @@ Description: size attribute, the resulting physical address space determined by the driver is reflected here. It is therefore not useful to read this before writing a value to the size attribute. + + +What: /sys/bus/cxl/devices/regionZ/target[0..N] +Date: May, 2022 +KernelVersion: v5.20 +Contact: linux-cxl@vger.kernel.org +Description: + (RW) Write an endpoint decoder object name to 'targetX' where X + is the intended position of the endpoint device in the region + interleave and N is the 'interleave_ways' setting for the + region. ENXIO is returned if the write results in an impossible + to map decode scenario, like the endpoint is unreachable at that + position relative to the root decoder interleave. EBUSY is + returned if the position in the region is already occupied, or + if the region is not in a state to accept interleave + configuration changes. EINVAL is returned if the object name is + not an endpoint decoder. Once all positions have been + successfully written a final validation for decode conflicts is + performed before activating the region. |